At the end I can't remove the image or see the image controls. During another test I couldn't edit the caption. When I tried to highlight to delete the image the browser thought I wanted to move back a page. So the page lost focus.

Many thanks for the video! With it I was able to replicate this issue on third attempt and I've got the same result as you.
It looks like the culprit is caption here - I tried remove images without editing caption and then it was working. I'm marking this as bug so developers can work on it to fix this.

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